It's rather astonishing that all the safety regulations for cars manage to exist in the same legal system that allows motorcycles on public roads at all. Last I read the death risk ratio was about 24x.
More likely it's just because cycles existed before the safety regulations and there would be too much backlash to banning them. Plenty of other things that only harm yourself, like drugs or unpasteurized milk are also illegal.
I’m still amazed by this one. My first thought on riding a 250 was “how is this possibly legal?” And then the jump to a big bore (non-cruiser) is completely insane.
In a car you tend to hurt other people including any kids, etc that may be along for the ride.